Improvement in steam-valves



H. P. JONES.

Steam-Valves.

No, 142,702, PatentedSeptemlm'i),1873.`

NITED STATES PATENT- OEEIcE.

HARVEY I. JONES, OF DAVENPORT, IOWA.

IMPROVEMENT IN STEAM-VALVES.

Specification forming part of Letters Patent No. 142,702, datedSeptember 9, 1873; application filed May 7, 1813.

To all whom it may concern:

Be it known that I, HARVEY l?. JONES, of Davenport, in the county ofScott and State of Iowa, have invented a new and useful Improvement inSteam-Valves; and I do hereby declare the following to be a full andexact description of the same, reference being had to the accompanyingdrawings forming part of this specification, in which- Figure l is aplan view of.' my invention with the exhaust-chamber removed. Fig. 2 isa longitudinal central section, and Fig. 3 an end elevation, and Fig. 4a detached view,

' of one of the boxes.

Similar letters of reference in the accompanying drawings denote thesame parts.l

This invention has for its object to produce a valve for steam-engineswhich is simple in construction, hard to get out of order, and easy towork as compared with valves in common use. To this end the inventionconsists, partly, in the arrangement for equalizing the expansion ot'the valve and its seat, so as to prevent the escape of steam between thetwo, and partly in an arrangement for adjusting the valve to thevalve-seat as the degree of expansion of either of these parts mayrequire, all which l will now proceed to explain.

valve, the same being of the oscillating variety, and of quadrantalshape, and having trunnions B, which supportthe valve within the box O.The valve is made hollow, in order to serve as a reservoir for supplyingthe cylinder with steam, and has two inlet-ports, D, one near each side,which ports, as the valve oscillates,receive steam alternately from thepassages E, and discharge it by the same port that receives it into thecylinder through the ports F alternately. The passages E connect thevalve-seat with the hollow-walled box C, which receives steam from theboiler and conveys it on all sides of the valve-seat, in order to causethe seat to expand equally in all parts, in the same manner as the valvedoes, by reason of the introduction of steam into its interior. Thisequal expansion causes the valve to work tightly enough to prevent Inthe accompanying drawings, A is the the escape of steam between it andthe seat. If the expansion proceed sofar as to produce binding betweenthe valve and seat, this can be compensated by shifting the adjustableboxes G, which are fastened to the outside of the box C, and support thetrunnions B, each box G being supplemented by another box, G', attacheddirectly above it to the end of the exhaust-chamber H. These boxes havedovetail offsets I, which it between dovetail lugs J, and have alsoelongated slots K, through which set screws L pass into the sides of thebox O and chamber H, so that, the set-screws being loosened, the boxesmay be raised or lowered at pleasure, and then fastened by tighteningthe screws. M is the exhaust-pipe, the same being of funnel shape,

Aand running through the middle of the valve A, and termin ating at theapex of the same, immediately beneath the pipe N, which projects up intothe exhaust-chamber a short distance, in order to prevent grit of anykind from being sucked back into the cylinder when steam is shut oft'and the engine still continues in motion. Steam enters the pipe M by theports F alternately, and escapes from the exhaustchamber, at one cornerof the same, through a passage leading to the adjacent corner of the boxC, where it escapes by a pipe, O. The steampipe P from the boiler opensinto the space Q between the walls of the box C, which space extendsentirely around the box. plates S, which form the sides of the valve,can be removed, in order to see how to set the valve.

I claim as my inventionl. The valve A, in combination with the removableside plates, substantially as and for the purpose set forth.

2. The adjustable boxes G, having an oft'- set, I, and slots K, incombination with the box G, having dovetail lugs J and with setscrews L,substantially as and for the purpose specified.

HARVEY P. JONES.

Witnesses:

F. P. L. REIMERs, H. C. WALES.

The

